// calculate sscan element delays
// Every beam's element delays are different
// so Sscan delay is a two dimension array
// first dimension is beam, second dimension is element
public static double[][] GetSscanDelays(
List <Point> elementPositions, // elements' positions
double velocity, // Test block's velocity, in m/s
SscanModel sscanModel // Focal point's true depth, in mm
)
{
var angles = GetSscanAngles(sscanModel);
double[][] delays = new double[angles.Count][];
int elemNum = elementPositions.Count;
// Loop through each angle beam
for (int angleIndex = 0; angleIndex < angles.Count; angleIndex++)
{
// calculate focal point
double focalY = sscanModel.FocusDepth;
// focalX = Tan(angle) * Focus depth
double focalX = Math.Tan(angles[angleIndex] * Math.PI / 180)
* sscanModel.FocusDepth;
Point focalPoint = new Point(focalX, focalY);
Debug.WriteLine($"Beam Angle: {angles[angleIndex]}," +
$" Focal Point: X {focalPoint.X} Y {focalPoint.Y}");
// calculate delays
delays[angleIndex] = GetElementDelays(elementPositions, velocity, focalPoint);
}
return(delays);
}
// calculate angles
public static List <double> GetSscanAngles(SscanModel sscanModel)
{
List <double> angles = new List <double>();
var angle = sscanModel.StartAngle;
while (angle <= sscanModel.EndAngle)
{
angles.Add(angle);
angle = angle + sscanModel.AngleResolution;
}
return(angles);
}
